A Monopolist Sells in Two Markets

A monopolist sells in two markets. The demand curve for her product is given by p₁ = 122 - 2x₁ in the first market and p₂ = 306 - 5x₂ in the second market, where x_i is the quantity sold in market i and p_i is the price charged in market i. She has a constant marginal cost of production, c = 6, and no fixed costs. She can charge different prices in the two markets. What is the profit-maximizing combination of quantities for this monopolist?

A) x₁ = 58 and x₂ = 32.
B) x₁ = 29 and x₂ = 30.
C) x₁ = 59 and x₂ = 29.
D) x₁ = 39 and x₂ = 28.
E) x₁ = 49 and x₂ = 40.